<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<script type="text/javascript">
			var s = "ytrhdaaaufsrfeaadhubfdfasd";
			var s1 = s.substr(2,5);
			alert(s1);
			var s2 = s.substring(0,5);
			alert(s2);
//			String s3 = s.charCodeAt(5);
//			alert(String.fromCharCode(97,98,99,100));
			
		</script>
	</head>
	<body>
	</body>
</html>
